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This paper will describe the design criteria for a single cylinder version of the Daimler-Chrysler OM441LA engine, which is currently used in multicylinder form as a key test in the ACEA A4 and A5 Oil Sequences. A test procedure has been developed for the single cylinder which provides results correlating with its multicylinder counterpart. The historical development of the procedure, correlation data, and economic benefits of use will be presented.